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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df71f55ae416961f83fbc16acd881bdd85821a9cb29ae69053fa4efd43099cf' 
  AND token = 'G2Kjpv4a2hmIFEC0goeMvKYG36RikFKbBBM63h8YwvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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