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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52fee72369914782c343393a749f918e2de8cce9c243154a2d8419b69e0c012' 
  AND token = 'CpxtAW301rM0R7kSZc4nVrNkhIff6pJiKVaRrh1TyEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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