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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0c0bcee9d46a8aae5141e72e7783ca9c8985e49b6006ba26e67aeb135cea70' 
  AND token = '6Adkijo/sXXFb884iWX9R9MP9R0ekxwbDArwlKIVP+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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