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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9a538403a5de5d7252ce6e86105f7fd240c86bf849e52f31b1dbd3e05e062c' 
  AND token = '7Zw67JpdGLfaR46R5AE8kBLTMyy6WxBXM0jRQCpQlYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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