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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669e312f23716e54b97a3aaf19dd2913c2eb72edc0fbc33cc6a78b7a801122e9' 
  AND token = '4DGGHPq9H6+StJ7/FU+to1NFZxaKWUCaXPY5J8QKj90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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