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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8ad49fab233f8957c88705ca48dfb8a1fa3a755bd30eb42a6555c09a755f58' 
  AND token = 'im4nBl8OacMcBwFbPP0xGXZl7RhR5ZMeAZ+acB2UxIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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