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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c89ef1d4aff919492347f8996099f9e23851c15ece2566bdd59fbc241730512' 
  AND token = 'o66M0OFvD7WB97fEr6krtCT/oh077iDZY+2iXSPvqGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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