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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0267bf1b6efb47b13ffe1b10548a528a2391c2b0de689a28ed2780573044ddc2' 
  AND token = 'zJIDVcb8CHLrukg7RCGarr/gBp72hM2a4iPfaM3Jt2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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