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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fa20b9e6633a77fd3c0c728b13650a29dc098e7cc42fa149eab144deff7090' 
  AND token = 'A0hnUKMU4LEG2gPT3lmtyhWiysjsGCOitX+1gWpQdhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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