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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6db9053cd595111a190f0fbcaaf0c5a9531e3f51cda614bfc3173208be62f9' 
  AND token = 'tlRbINwGt1NCk6H2hdDs4Fp1r0lU0s9gfuHlhDNL4TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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