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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a80bed0c3d5288b6fb18cac640252a59283d3eba9dd5e716eeebe0185d0023' 
  AND token = '3DNs9i8/4IkIbd6xwRGfcVEheRyxx9hfBT4VPmZdL1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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