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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7b5b33d72fd7a268feb4734d412ba52701ffa0a91f7054a63c1b0432a77e54' 
  AND token = '0sdxIR4oCUK0a3D3Ew+yOiDeVcxFvW7bTImpmoBrkSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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