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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102c69b49361558264ff94857113a5195cd9819e50ddb1af85b5d2e0c8a1bcaf' 
  AND token = 'vQip4FrTM8pP3kCyoIhl6e+QoM7J4ulezn86yoRLoXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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