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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b95660830bf86b28a87fff379144245c653f9d92648754840cd30f4d5bd38c1' 
  AND token = 'mUPRRiYn4BrtQ7cVnWm3Zqi55gEyDCuuXE151A67ObI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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