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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2b65517e51392190178499b9375ec88f880d311fb4c2cd999fa56142874312' 
  AND token = '8WX+EteSwTV9ckginw1rgHZt2qwN/MZ1QxefFXqrnoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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