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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c917c73f388acae5f8d4ab98c72c0a6535f58c85b4c1c65973e19186346a6569' 
  AND token = 'HI5gPLIbX9JGP0+lciLKTHGX+9eCVljv4gHEn3ofJdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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