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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a668b0d206bd0d9de333d57241d8702b420c885080aaee7f78e760fd78f8644' 
  AND token = 'iKmLdmfPWxBp+W9pc0EnETerhRjoaxoeACy4J09yq2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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