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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807d10d5c33598e25cc4548be0ebb253a41e53f45dafc9282ac7d7a0cdd0ab67' 
  AND token = '+2n8GuWjD0CvlrKlDqxYCqL/LiSO8XW57E30BFgfxxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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