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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bb7d29a2478317e0bdbdfa13d1fb7239ee8d2d2862580c1a0facb1617c56ad' 
  AND token = 'WqflqL1eMPgz1oU4GEXvBNgmRN8zkM7v3oWQ4vA4ZRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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