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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4ed84624e416fe84ace61c11a4dace17e29189920c11b788a8a9d0669590df' 
  AND token = 'vdtbvb+TDEfgTe5mDKZBv6wdZcV9B0LIy+uL+l4Dpog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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