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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0f03eefbb3f95ba7e1f3ea95b19dd0ba816e8c15ace98fff37c3c6826df749' 
  AND token = 'fHRt6mzQ0K1GXqVFZV8mI+FvZObvcafGu0IfK+qm6RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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