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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693739a826c714d1cf1a14b7a02d1330afb9692aed9af81958f949913e5e75a1' 
  AND token = 'X1t0s6uIS91ZPmWLT4KP8xM4CKZqviV7NkkP1gI015o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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