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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83e50b32f0c2351a44677bb61f2a40ef920f8889adc573b0d23f537329f6f65' 
  AND token = 'rr7WdsySnLyngcGixgZ8jEpECf//rgX9MVuSoojhm5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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