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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe984017b134ca43e0c00eef4d7954d360906d9495e6dbb78b3f15d350c0e0ad' 
  AND token = '0M7Y4yCha6cXVFtwUPw3/DVQvU4SaHfWK0PvXI1hBBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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