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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6ed33e83f5ad1f928798d63c55c1ba4e2bd6a6e05a7a53712270504c1887f1' 
  AND token = 'vXGJQUz1NACstNkVCynqp0xyyQ9WjIxzDcORSEGuS6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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