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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c96f3644549c498b0bde2eac30b8736910ff707a8956eb70dbc447ed05091e6' 
  AND token = 'J3nrR6HngB+LDN62TMc4tjHVz+3NIff148eYMuANq6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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