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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783ea2aa24c2b16392059ce47d25e5cceb08189f480ef047ecb646aaebeba6c5' 
  AND token = '+uXTajxPUf0marWtlA2umdsnoX+S0vSOA+nB6V43nuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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