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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfca0902b05e178acfd3f15689cf367424153cf0a3d3ad3517f79af9c9be98c' 
  AND token = '/VpdbJv8jt9w41eDQzNHZA7lz2drUboFPECEv+/9Kb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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