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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56234cb62d601f55c935e679459b1e0b123db5db483f3047e8bd7895f79e1914' 
  AND token = 'TbsXFt13qVZfCBmJ5fu+UR0gT5XENUMJi6kp90c7cDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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