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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3188dc7826d48d1a6367306b4c7efab9b62d6c09431860485e449d0e9446b7cd' 
  AND token = 'O8B8qPlG21mBFAiqD7mwW4BH528wFuovH42fYZayoFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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