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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51953e5ce2b81e8a75e12b376c2a0294cd36b4876540a1b69d4e7f83f164e15' 
  AND token = 'AHTPaWmeU4cUNuRGQyXVMwQCjOavx/alqTjiNsePPaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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