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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0be6eb993243178417bf387a2d9d3ed21af59bbfc883a39f1c51101f8af1ba4' 
  AND token = 'tD9JyYBIf1P0g9OjP2aj3/qpckAaxN5BC+1VI2xeUio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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