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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97695be37cdcb6713dd29fb3fe706b0ed90c415731db6200e399079daf086e37' 
  AND token = 'fjOnPOKduCdX25l2F7B1ua5w0aS9nz81AC1zCXE9i9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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