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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd1733d510c02f716326879cf6116575f80552012f05038ba9e86b200c90961' 
  AND token = 'wE39Qbz8//ibBfPV/MhRyQ+pBfu6CbMfOy+qLgHiTGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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