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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c531eb9ef4a117bd4803a967d2f898ec0ed38e7cdbff599f9a13f5b164fa8788' 
  AND token = 'nnI2wp2GqDuDI8c3U7bDWcFWu4BORXXzvP886nAbqhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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