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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6583b05d06bf4963cfe454b3e04571cc33190c9226b499228014eec7b7296b58' 
  AND token = 'GM58PJY+hkGfarrc4/ixBF21y9u917Uk2tWgi87reUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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