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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee0f56e3af43a66a98ce188db840246975d59227643f8a9277cc9c98dcd6e42' 
  AND token = 'qBc4WqH5DieX0jLGGlW0cqROtKt+t0Hfc0eXbrpSthw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}