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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1d5031b018512037f9af2a4e6ed990fb4d9f5a120b8bc70cfc62f015e2aa37' 
  AND token = 'umyZ4MeECaxtZDtOJAy1qz1ofQggLK4uLWwJ0XyBubA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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