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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e760214e5b8aaf0d591892e8c2045746395c09f2d1161ddd5cab1fb6f735993b' 
  AND token = 'EJUC0/raqeg+yyzm7hSXlmjk1dT8ZohCkfzIJ32cE2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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