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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83e12ef929eab6d14f5c9911594b4e9e159a734a9d7c39ec7d4f125b5a12e95' 
  AND token = 'bS/nVOyVgiE5AKJmrC6Duq6x6hPlCY0Bo07KSchc3Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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