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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283e79a527e8e1404bb7542522a710c19c62d22473cbcb3ff23af389d75fe00c' 
  AND token = 'rjIPhF3JV7rF0xVorF9KPrkUmnCW3XTwE9rlLfzhJ1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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