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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9878324244acbbe05ab00bb84f193469e4e956a0245d0596e350c8ead29bc79' 
  AND token = 'CPwS030L1YeFpKqvr/LDS+O/Y2JOj2sSn3IQ9o6h5Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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