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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f7216faf42a5889104d6a6784ea3e667375305cc5fb7236ff096e85f9479b0' 
  AND token = 'cJA+woN7rusMl/aM9sZ9HS7zaAF6bs+6cQeNHEqsXXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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