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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b98ab1a508931c47d2428d3de35528cdd93f1b0d090d582896657c8447c52e' 
  AND token = 'nBQwWXdjh5ND2StCCaOoNx7CXL8FPAyxoA2AQX6Dp+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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