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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e210875950df706795c7890e063ee1ddda3b90b3f2c5e3c4c805a0cc4f7d05a' 
  AND token = '3kPse6jCAag/9jTrJEAyo3/0RZEXrKL9Lrtwajv4KS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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