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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c4e71d59db584f85942a7a1d74cad2eb8ee9e325902407595f6a8570be2e57' 
  AND token = 'H9bcyat/TF6IVBXBu9s41Nhzqxu0d3OXfk9o0BjxNgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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