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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0f74f2a6a1b2ff1b589d06028786808d473ea2aa2065713ee45350ba54bcae' 
  AND token = 'mvfybbRugVsXknXG233taxR9j6Y6XH7wm0ed7ZqUfvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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