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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8ab42a4d20d7e19f4db94880f6429a587ac5757fb19d2fce64cd240f658a9e' 
  AND token = 'twM5N83YbJR7CT4XDMcT9kN0kxtDEb4j97ylY1o66hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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