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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7663c8040ab12c6e8bdf34f5fb6a14f78ed6d73185faf97a7bf1b0bbef14a96' 
  AND token = '1xSnTixv/qZa9RD49i6zDEBPrBKK3oD6Fwshu3utdek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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