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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352bb4b42d386e8a2bc6ef462d0feccb8570c19069a4d5c5e5d0fada2918581f' 
  AND token = 'gbMBE82E3dwLZLDcJmYxejiiSygtLjz3BBp94V21LU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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