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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33ade0cb104c11c581ee45326b7eb30ef6316e55e428ecf1243c00a626a7c9b' 
  AND token = '7fzo03ik8OnbSYqcxfdIl0B1/klR4wI1WbFU8AmkTjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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