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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0bad0068a8b515d00cedf12b2300b2f6313ce35a23adea7d06c1b33d3e5cfb0' 
  AND token = 'tkQllboAksCeWrAn1wi3IgRPp3yB1nVSGzZDVv1ss9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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