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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd64d43c98444edc6592c91081f1cc7f6136aaaa8bb0132dd8d634cbe7bd02d' 
  AND token = 'TFT21R9VBVBfNw5BC2E6Vzl9UjriGRBNcb2AtLCPgM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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