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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044abfeadf6264ed12c050a46106d11e7bd99e9fe40bab5e099366df6c7881c5' 
  AND token = 'dDAKnF2Pk7vfwu5l/t9HuAdWTiUrdHCq83dV5BIpFEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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