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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f23b9f336b982d6adedbb2d7d41400c29fc2a59602a01dac9a55cc36de1333' 
  AND token = 'B59U21mfiRiLF9AT6FLfLdAQLyXcasd7m3JXTNxo/S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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