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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a63a9ef5b89c2cb006507ce7223f580e19ae098b27ee6c0bc31c08445ae174d' 
  AND token = '8iHnvWFK2ORmQyA3vMGAo9V7oY6yISOGG9fGEPp1CP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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