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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936b8f8f591b435cfa52ea3644f2503e32059112b562b085dfcb3e4d32baf853' 
  AND token = 'Ig0Spzt4R2kgcoyjBjb/aHF+lYROR46SlHwTRpty/c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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